GH-30717: [C#] Add ToString() methods to Arrow classes

csharp/src/Apache.Arrow/ChunkedArray.cs

@@ -15,7 +15,6 @@
 
 using System;
 using System.Collections.Generic;
-using Apache.Arrow;
 using Apache.Arrow.Types;
 
 namespace Apache.Arrow
@@ -86,6 +85,8 @@ public ChunkedArray Slice(long offset)
             return Slice(offset, Length - offset);
         }
 
+        public override string ToString() => $"{nameof(ChunkedArray)}: Length={Length}, DataType={DataType.Name}";
+
         // TODO: Flatten for Structs
     }
 }

csharp/src/Apache.Arrow/Field.cs

@@ -33,6 +33,8 @@ public partial class Field
 
         public IReadOnlyDictionary<string, string> Metadata { get; }
 
+        public override string ToString() => $"{nameof(Field)}: Name={Name}, Data type={DataType.Name}, IsNullable={IsNullable}, Num metadata={Metadata?.Count}";
+
         public Field(string name, IArrowType dataType, bool nullable,
             IEnumerable<KeyValuePair<string, string>> metadata = default)
             : this(name, dataType, nullable)

csharp/src/Apache.Arrow/RecordBatch.cs

@@ -93,5 +93,7 @@ public RecordBatch Clone(MemoryAllocator allocator = default)
             IEnumerable<IArrowArray> arrays = _arrays.Select(array => ArrowArrayFactory.BuildArray(array.Data.Clone(allocator)));
             return new RecordBatch(Schema, arrays, Length);
         }
+
+        public override string ToString() => $"{nameof(RecordBatch)}: Length={Length}, ColumnCount={ColumnCount}";
     }
 }

csharp/src/Apache.Arrow/Schema.cs

@@ -114,5 +114,7 @@ public Schema SetField(int fieldIndex, Field newField)
 
             return new Schema(fields, Metadata);
         }
+
+        public override string ToString() => $"{nameof(Schema)}: Num fields={_fieldsList.Count}, Num metadata={Metadata?.Count}";
     }
 }

csharp/src/Apache.Arrow/Table.cs

@@ -107,6 +107,8 @@ public Table SetColumn(int columnIndex, Column column)
             return new Table(newSchema, newColumns);
         }
 
+        public override string ToString() => $"{nameof(Table)}: {ColumnCount} columns by {RowCount} rows";
+
         // TODO: Flatten for Tables with Lists/Structs?
     }
 }